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diff --git a/fluent-bit/lib/librdkafka-2.1.0/src/rdfloat.h b/fluent-bit/lib/librdkafka-2.1.0/src/rdfloat.h
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+/*
+ * librdkafka - Apache Kafka C library
+ *
+ * Copyright (c) 2012-2018, Magnus Edenhill
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <math.h>
+
+/**
+ * rd_dbl_eq0(a,b,prec)
+ * Check two doubles for equality with the specified precision.
+ * Use this instead of != and == for all floats/doubles.
+ * More info:
+ *  http://docs.sun.com/source/806-3568/ncg_goldberg.html
+ */
+static RD_INLINE RD_UNUSED int rd_dbl_eq0(double a, double b, double prec) {
+        return fabs(a - b) < prec;
+}
+
+/* A default 'good' double-equality precision value.
+ * This rather timid epsilon value is useful for tenths, hundreths,
+ * and thousands parts, but not anything more precis than that.
+ * If a higher precision is needed, use dbl_eq0 and dbl_eq0 directly
+ * and specify your own precision. */
+#define RD_DBL_EPSILON 0.00001
+
+/**
+ * rd_dbl_eq(a,b)
+ * Same as rd_dbl_eq0() above but with a predefined 'good' precision.
+ */
+#define rd_dbl_eq(a, b) rd_dbl_eq0(a, b, RD_DBL_EPSILON)
+
+/**
+ * rd_dbl_ne(a,b)
+ * Same as rd_dbl_eq() above but with reversed logic: not-equal.
+ */
+#define rd_dbl_ne(a, b) (!rd_dbl_eq0(a, b, RD_DBL_EPSILON))
+
+/**
+ * rd_dbl_zero(a)
+ * Checks if the double `a' is zero (or close enough).
+ */
+#define rd_dbl_zero(a) rd_dbl_eq0(a, 0.0, RD_DBL_EPSILON)